Two-revolution cylinder printing-press.



.No. 819,716. 7 PATENTED MAY 8, 1906.

B. F. BERRY.

TWO REVOLUTION CYLINDER PRINTING PRESS.

APPLICATION FILED FEBJG. 1905.

Ill! lllll W l I UNITED STATES PATENT OFFICE.

BENJAMIN F. BERRY, OF ST. LOUIS, MISSOURI, ASSIGNOR TO UNITED PRINTING MACHINERY COMPANY, OF BOSTON,

CORPORATION.

MASSACHUSETTS, A

Specification of Letters Patent.

Patented May 8, 1906.

Application filed February 16, 1905. Serial No. 245,857.

To all whom) it may concern:

Be it known that I, BENJAMIN F. BERRY, a citizen of the United States, residing in the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Two Revolution Cylinder Printing-Presses, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

In the use of two-revolution cylinder printing-presses, as in other forms of printingpresses, it is common practice to pack the impression-cylinder with sheets of aper to comensate for the unevenness o the type or form printed from or for the existence of low type among higher type, all of which are carried by the bed of the press. This packing has the effect of increasing the periphery of the impression-cylinder, and as a consequence the periphery of the cylinder does not rotate in proper conformity to the positively-driven bed, as provided for in the original construction of the press, and a dragging effect is roduced upon the type or form, due to W 'ch the printing accomplished is blurred and imperfect.

My invention relates to a similar improvement in two-revolution cylinder printingpresses to that shown and described in application for Letters Patent filed by me December 17, 1904, Serial No. 237,194, the object of the improvement being to provide a limited degree of play in the drivingear associated with the spindle of the press-cylinder during the printing action, thereby permitting travel of the cylinder and bed in harmony and obviating conflict between the cylinder and bed gearing and the cylinder-driving gear.

Figure I is an end elevation of the parts of a printing-press to which my improvements relate. Fig. II is a vertical section taken on the irregular line II II, Fig. I, with one end of the press-cylinder and the bed-rack-enga ing gear-wheel shown in elevation. Fig. I I is an elevation of the cylinder-carried bed-rack engaging gear-wheel and fragments of the bed and its rack and the bed-support. Fig. IV is a view of a portion of the periphery of the cylinder driving gear wheel and. the toothed segment associated with said gearwheel. Fig. V is an enlarged cross-section taken on line V V, Fig. I.

,1 desi nates the impression-cylinder of a two-revo ution printing-press provided with spindles, one of which (indicated by the numeral 2) is shown in Figs. I to III, inclusive. This spindle is rotatably supported'in a side frame member 3 of the press.

4 is a bed-rack-engaging gear-wheel fixed to the spindle 2, and 5 1s the rack carried by the form-bed 6, with which said gear-wheel is adapted to mesh. The bed 6 is mounted upon a support 7.

8 is a power gear-wheel.

N 0 invention per se is herein claimed for the parts thus far described, they being com mon to two revolution cylinder printing presses.

9 designates a crank-arm that is provided with a hub 10, fixed to the cylinder-spindle 2. This crank-arm has at its free end a toothed segment 11, the teeth of which at the center thereof are spaced apart and are of a size corresponding with the teeth of the power gearwheel 8, with which said segment is adapted to intermittently engage. The teeth at the ends of said segment are spaced apart more widely than those at the center.

12 designates a gear-wheel loosely mount-,

ed upon the hub 10 of the crank-arm 9 and so positioned relative to the power-wheel 8 as to travel in continuous mesh therewith. At the side of the gear-wheel 12 at which the crank-arm 9 is located is a pocket 18, in which said crank-arm is seated, the said pocket be ing enlarged at the peripheral-toothed ortion of the wheel to permit movement 0 the crank-arm segment therein. Projecting from the gear-wheel 12 at opposite sides of the pocket 13 are ears 14, in which are seated adjustment-screws 15, that serve to limit the movement of the gear-wheel with respect to said crank-arm which occupies a positlon between said screws.

In the practical use of a printing-press having my lmprovement incorporated therein the o eration is as follows: The power gearwheeFS rotates continuously by power suitably a plied thereto and the form-bed is continual y reciprocated by the driving mechanism associated therewith and actuatin it in- During the rotation of, the power-wheel 8 rotation is imparted to the the usual manner.

loosely-mounted gear-wheel 12, with which said power-wheel meshes, and as a conse quence the crank-arm 9,fiXed to thecylinderspindle, is carried intermittently to the powerwheel, so that its segment 11 will be brought into mesh therewith at intervals. The parts are so timed that upon each forward stroke of the form-bed 6 the forward end of the bedrack 5 is brought into juxtaposition with the rack-engaging gear-wheel 4 simultaneously with the movement of the crank-arm segment to the ower-wheel 8. The crank-arm is thereby p aced in direct engagement with the power gear-wheel and it is rotated momentarily in a positive manner, due to such engagement, and acts to rotate the impressi'on-cylinder 1 and-rack-engaging gear-wheel 4-positivelyfor asufiicient period to cause said r-ack-enga ing ear-wheel to enter into mesh with the %IS13' ew teeth of the bed-rack 5. Immediately after this engagement is accomli'shedthe crank-arm segment becomes sep- 'arated from the power-wheel 8 to continue rotation with the crank-arm while the im-- pression-cylinder is rotating, and although the gear-wheel 12 continues in mesh with the power-wheel there is sufficient lost motion present between these wheels to prevent direct driving action of the impression-cylinder through the-medium-of the power-wheel, due to the loose mounting, of the ear-wheel 1'2 and the:play between said wheel and the crank-arm 9.- This being the fact, the formbed is permitted to impart rotation to the impression-cylinder through the medium of the-rack 5'and. rack-engaging gear-wheel 4 during the continued forward stroke of said bed, while the printing action is being carried out. By this arrangement the form-bed and impression-cylinder-are caused to travel in uniformity, as the bed serves to drive the cylinderduring the printing action and the cylind'er-driviirg members being subject to the play mentioned while continuing to rotate are placed out of conflict with the movement of the-cylinder and bed, so that the movement of the cylinder'by the bed will not be interferred with. By spacing the teeth at the ends of the'cr'ank-arm segment 11 more widely apart than at the center of the segment the segment enters more freely into mesh'with the teeth of the power gear-wheel 8 and becomes separated from said teeth more-readily on each engagement of these members, while the innermost teeth being made to correspond to the teeth of said power gear-wheel act to impart the positive driving movement to the segment. The adjustment-screws 15, carried by the gear-wheel 12 at both sides of the -crank-arm, serve to limit the-degree ofrotation of said gear-wheel in either-a forward direction or a rearward direction. The ear-wheel 12 is therefore restricted'in its p ay in both directions of rotation-of'which it is susceptible, and as a consequence only the reopuisite degree of movement of the gear-wheel relative to the crankarm 9 is secured to cause the crank-arm to properly enter into engagement with the power-wheel 8 and perform the office for which it is intended.

I claim as my invention 1. In a cylinder printing-press, the combination of a cylinder, a bed adapted to move into driving connection with said cylinder, means for rotating said cylinder arranged to be periodically thrown out of driving action during the rotation of said cylinder, and means for restricting the movement of amember of said cylinder-rotating means in two directions of rotation, substantially as set forth.

2. In a cylinder printing press, the combination of a cylinder, a bed adapted to move into driving connection with said cylinder, a driving member loosely associated with said cylinder, a driven member havingfiXed connection with said cylinder, and means for restricting the movement of said loosely-associated driving member in two directions of rotation with respect to said fiXed driving member, substantially as set forth.

3. In a cylinder printing-press, the combination of a cylinder, a bed ada ted to move into driving connection with said cylinder, a driving member loosely associated withsaid cylinder, at crank-arm having fixed connection to said cylinder, and means for restricting the movement of said loose driving member in two directions of rotation with respect to said crank-arm, substantially as set forth.

4. In a two-revolution cylinder printingpress, the combination of a reciprocatory form bed, a rotatable impression cylinder adapted to be thrown into gear with said form-bed, a power-wheel, a loosely-mounted gear-wheel associated with said cylinder, and a crank-arm having fixed engagement with said cylinder and mounted adjacent to said loose gear-Wheel to be brought periodically into engagement with said power-wheel, substantially as set forth.

5. In a two-revolution cylinder printing press, the combination of a reciprocatory bed, a cylinder geared to said bed, a crank-arm having fixed connection to said cylinder and provided with a toothed segment, a gearwheel loosely associated with said crank-arm, and a power gear-wheel arranged in mesh with said loose gear-wheel, .and adapted to engage said crank arm. segment, substantially as set forth.

6. In a two-revolution cylinder printingpress, the combination of a reciprocatory bed, a cylinder geared to said bed, a crank-arm having fixed connection to said cylinder, and provided with a toothed segment, a gear.- wheel loosely associated'with said crank-arm and provided with a pocket in which said arm is seated, and a power-wheel arranged in mesh With said loose gear-Wheel and adapted is seated, a power-Wheel arranged iifrnesh to engage said crank-arm segment, substanwith said loose gear-Wheel and adapted to tially as set forth. engage said crank-arm segment, and adjust- 7. In a two-revolution cylinder printing- Inent-screWs carried by said loose gear-Wheel 5 press, the combination of a reciprocatory bed, at opposite sides of said crank-arm, substan- I 5 a cylinder geared to said bed, a crank-arm tially as set forth.

having fixed connection to said cylinder and BENJAMIN F. BERRY. provided with a toothed segment, a gear- In presence of Wheel loosely associated with said crank-arm NELLIE V. ALEXANDER,

IO and provided With a pocket in which said arm BLANGHE HOGAN. 

